repository.c

   1 #include "cache.h"
   2 #include "repository.h"
   3 #include "object-store.h"
   4 #include "config.h"
   5 #include "object.h"
   6 #include "lockfile.h"
   7 #include "submodule-config.h"
   8
   9 /* The main repository */
  10 static struct repository the_repo;
  11 struct repository *the_repository;
  12
  13 void initialize_the_repository(void)
  14 {
  15         the_repository = &the_repo;
  16
  17         the_repo.index = &the_index;
  18         the_repo.objects = raw_object_store_new();
  19         the_repo.parsed_objects = parsed_object_pool_new();
  20
  21         repo_set_hash_algo(&the_repo, GIT_HASH_SHA1);
  22 }
  23
  24 static void expand_base_dir(char **out, const char *in,
  25                             const char *base_dir, const char *def_in)
  26 {
  27         free(*out);
  28         if (in)
  29                 *out = xstrdup(in);
  30         else
  31                 *out = xstrfmt("%s/%s", base_dir, def_in);
  32 }
  33
  34 static void repo_set_commondir(struct repository *repo,
  35                                const char *commondir)
  36 {
  37         struct strbuf sb = STRBUF_INIT;
  38
  39         free(repo->commondir);
  40
  41         if (commondir) {
  42                 repo->different_commondir = 1;
  43                 repo->commondir = xstrdup(commondir);
  44                 return;
  45         }
  46
  47         repo->different_commondir = get_common_dir_noenv(&sb, repo->gitdir);
  48         repo->commondir = strbuf_detach(&sb, NULL);
  49 }
  50
  51 void repo_set_gitdir(struct repository *repo,
  52                      const char *root,
  53                      const struct set_gitdir_args *o)
  54 {
  55         const char *gitfile = read_gitfile(root);
  56         /*
  57          * repo->gitdir is saved because the caller could pass "root"
  58          * that also points to repo->gitdir. We want to keep it alive
  59          * until after xstrdup(root). Then we can free it.
  60          */
  61         char *old_gitdir = repo->gitdir;
  62
  63         repo->gitdir = xstrdup(gitfile ? gitfile : root);
  64         free(old_gitdir);
  65
  66         repo_set_commondir(repo, o->commondir);
  67
  68         if (!repo->objects->odb) {
  69                 repo->objects->odb = xcalloc(1, sizeof(*repo->objects->odb));
  70                 repo->objects->odb_tail = &repo->objects->odb->next;
  71         }
  72         expand_base_dir(&repo->objects->odb->path, o->object_dir,
  73                         repo->commondir, "objects");
  74
  75         free(repo->objects->alternate_db);
  76         repo->objects->alternate_db = xstrdup_or_null(o->alternate_db);
  77         expand_base_dir(&repo->graft_file, o->graft_file,
  78                         repo->commondir, "info/grafts");
  79         expand_base_dir(&repo->index_file, o->index_file,
  80                         repo->gitdir, "index");
  81 }
  82
  83 void repo_set_hash_algo(struct repository *repo, int hash_algo)
  84 {
  85         repo->hash_algo = &hash_algos[hash_algo];
  86 }
  87
  88 /*
  89  * Attempt to resolve and set the provided 'gitdir' for repository 'repo'.
  90  * Return 0 upon success and a non-zero value upon failure.
  91  */
  92 static int repo_init_gitdir(struct repository *repo, const char *gitdir)
  93 {
  94         int ret = 0;
  95         int error = 0;
  96         char *abspath = NULL;
  97         const char *resolved_gitdir;
  98         struct set_gitdir_args args = { NULL };
  99
 100         abspath = real_pathdup(gitdir, 0);
 101         if (!abspath) {
 102                 ret = -1;
 103                 goto out;
 104         }
 105
 106         /* 'gitdir' must reference the gitdir directly */
 107         resolved_gitdir = resolve_gitdir_gently(abspath, &error);
 108         if (!resolved_gitdir) {
 109                 ret = -1;
 110                 goto out;
 111         }
 112
 113         repo_set_gitdir(repo, resolved_gitdir, &args);
 114
 115 out:
 116         free(abspath);
 117         return ret;
 118 }
 119
 120 void repo_set_worktree(struct repository *repo, const char *path)
 121 {
 122         repo->worktree = real_pathdup(path, 1);
 123 }
 124
 125 static int read_and_verify_repository_format(struct repository_format *format,
 126                                              const char *commondir)
 127 {
 128         int ret = 0;
 129         struct strbuf sb = STRBUF_INIT;
 130
 131         strbuf_addf(&sb, "%s/config", commondir);
 132         read_repository_format(format, sb.buf);
 133         strbuf_reset(&sb);
 134
 135         if (verify_repository_format(format, &sb) < 0) {
 136                 warning("%s", sb.buf);
 137                 ret = -1;
 138         }
 139
 140         strbuf_release(&sb);
 141         return ret;
 142 }
 143
 144 /*
 145  * Initialize 'repo' based on the provided 'gitdir'.
 146  * Return 0 upon success and a non-zero value upon failure.
 147  */
 148 int repo_init(struct repository *repo,
 149               const char *gitdir,
 150               const char *worktree)
 151 {
 152         struct repository_format format;
 153         memset(repo, 0, sizeof(*repo));
 154
 155         repo->objects = raw_object_store_new();
 156         repo->parsed_objects = parsed_object_pool_new();
 157
 158         if (repo_init_gitdir(repo, gitdir))
 159                 goto error;
 160
 161         if (read_and_verify_repository_format(&format, repo->commondir))
 162                 goto error;
 163
 164         repo_set_hash_algo(repo, format.hash_algo);
 165
 166         if (worktree)
 167                 repo_set_worktree(repo, worktree);
 168
 169         return 0;
 170
 171 error:
 172         repo_clear(repo);
 173         return -1;
 174 }
 175
 176 /*
 177  * Initialize 'submodule' as the submodule given by 'path' in parent repository
 178  * 'superproject'.
 179  * Return 0 upon success and a non-zero value upon failure.
 180  */
 181 int repo_submodule_init(struct repository *submodule,
 182                         struct repository *superproject,
 183                         const char *path)
 184 {
 185         const struct submodule *sub;
 186         struct strbuf gitdir = STRBUF_INIT;
 187         struct strbuf worktree = STRBUF_INIT;
 188         int ret = 0;
 189
 190         sub = submodule_from_path(superproject, &null_oid, path);
 191         if (!sub) {
 192                 ret = -1;
 193                 goto out;
 194         }
 195
 196         strbuf_repo_worktree_path(&gitdir, superproject, "%s/.git", path);
 197         strbuf_repo_worktree_path(&worktree, superproject, "%s", path);
 198
 199         if (repo_init(submodule, gitdir.buf, worktree.buf)) {
 200                 /*
 201                  * If initilization fails then it may be due to the submodule
 202                  * not being populated in the superproject's worktree.  Instead
 203                  * we can try to initilize the submodule by finding it's gitdir
 204                  * in the superproject's 'modules' directory.  In this case the
 205                  * submodule would not have a worktree.
 206                  */
 207                 strbuf_reset(&gitdir);
 208                 strbuf_repo_git_path(&gitdir, superproject,
 209                                      "modules/%s", sub->name);
 210
 211                 if (repo_init(submodule, gitdir.buf, NULL)) {
 212                         ret = -1;
 213                         goto out;
 214                 }
 215         }
 216
 217         submodule->submodule_prefix = xstrfmt("%s%s/",
 218                                               superproject->submodule_prefix ?
 219                                               superproject->submodule_prefix :
 220                                               "", path);
 221
 222 out:
 223         strbuf_release(&gitdir);
 224         strbuf_release(&worktree);
 225         return ret;
 226 }
 227
 228 void repo_clear(struct repository *repo)
 229 {
 230         FREE_AND_NULL(repo->gitdir);
 231         FREE_AND_NULL(repo->commondir);
 232         FREE_AND_NULL(repo->graft_file);
 233         FREE_AND_NULL(repo->index_file);
 234         FREE_AND_NULL(repo->worktree);
 235         FREE_AND_NULL(repo->submodule_prefix);
 236
 237         raw_object_store_clear(repo->objects);
 238         FREE_AND_NULL(repo->objects);
 239
 240         parsed_object_pool_clear(repo->parsed_objects);
 241         FREE_AND_NULL(repo->parsed_objects);
 242
 243         if (repo->config) {
 244                 git_configset_clear(repo->config);
 245                 FREE_AND_NULL(repo->config);
 246         }
 247
 248         if (repo->submodule_cache) {
 249                 submodule_cache_free(repo->submodule_cache);
 250                 repo->submodule_cache = NULL;
 251         }
 252
 253         if (repo->index) {
 254                 discard_index(repo->index);
 255                 if (repo->index != &the_index)
 256                         FREE_AND_NULL(repo->index);
 257         }
 258 }
 259
 260 int repo_read_index(struct repository *repo)
 261 {
 262         if (!repo->index)
 263                 repo->index = xcalloc(1, sizeof(*repo->index));
 264
 265         return read_index_from(repo->index, repo->index_file, repo->gitdir);
 266 }
 267
 268 int repo_hold_locked_index(struct repository *repo,
 269                            struct lock_file *lf,
 270                            int flags)
 271 {
 272         if (!repo->index_file)
 273                 BUG("the repo hasn't been setup");
 274         return hold_lock_file_for_update(lf, repo->index_file, flags);
 275 }